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Analog Devices Inc. LTC3862EGN#TRPBF
- Part No.:
- LTC3862EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,409
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Product details
Overview
LTC3862EGN#TRPBF from Analog Devices is a two-phase, constant-frequency, peak current mode step-up DC/DC controller driving N-channel MOSFETs for boost and SEPIC topologies. It operates from 4V to 36V input, delivers up to 96% duty cycle, supports 75kHz–500kHz programmable switching frequency, and integrates dual 5V gate drivers with internal 5V and 3.8V LDOs. It is used in high-efficiency automotive and industrial 48V intermediate bus supplies.
For engineers reviewing the LTC3862EGN#TRPBF datasheet, LTC3862EGN#TRPBF pinout, LTC3862EGN#TRPBF application, or LTC3862EGN#TRPBF equivalent, key selection criteria include multi-phase synchronization capability (SYNC/CLKOUT/PHASEMODE), adjustable leading-edge blanking (BLANK), programmable max duty cycle (DMAX), and ±1% reference accuracy under temperature and line variation.
Technical Context
The LTC3862EGN#TRPBF implements fixed-frequency peak current mode control with two interleaved channels operating 180° out of phase, reducing input/output ripple and filter component stress. Its error amplifier (EA) compares FB voltage against a 1.223V internal reference and drives ITH to modulate peak inductor current; slope compensation gain is adjustable via SLOPE pin.
Phase synchronization uses an internal PLL with SYNC input (50kHz–650kHz range) and CLKOUT output; PHASEMODE pin selects 180°, 120°, or 60° inter-channel phase offset. DMAX pin sets maximum duty cycle (75%, 84%, or 96%) using precise 12× internal clock derivation, independent of external resistor tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz - set by single external resistor on FREQ pin; enables optimization of size vs. efficiency trade-offs. |
| Max Duty Cycle | Up to 96% - configured via DMAX pin (SGND = 96%, float = 84%, 3V8 = 75%), critical for high-step-up ratio applications. |
| Reference Accuracy | ±1% over temperature - ensures stable output regulation across –40°C to 85°C junction range (E-grade). |
| Gate Drive Voltage | 5V (INTVCC) - optimized for logic-level N-MOSFETs with low RDS(on), enabling efficient high-current boost stages. |
| Current Sense Threshold | 65mV to 90mV (adjustable via ITH) - provides accurate peak current limiting with <10mV channel-to-channel matching. |
| Soft-Start Control | Internal 5µA current source into SS pin - enables controlled ramp-up of output voltage to prevent inrush current and overshoot. |
Pinout & Package
Package: 24-Lead Narrow Plastic SSOP (GN24), 0.025" lead pitch, θJA = 85°C/W, exposed pad not present (unlike QFN/TSSOP variants).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum duty cycle programming | Connect to SGND/float/3V8 to select 96%/84%/75% limit - ensures safe operation at high VIN-to-VOUT ratios. |
| GATE1/GATE2 (Pins 16, 18) | N-channel MOSFET gate drivers | 5V outputs referenced to PGND - drive logic-level MOSFETs directly; each rated for 6V max absolute voltage. |
| SENSE1+/SENSE2+ (Pins 23, 13) | Positive current sense inputs | Differential inputs to current comparators - interface with low-side sense resistors for accurate peak current detection. |
| FB (Pin 8) | Error amplifier inverting input | Connects to resistive divider from VOUT - sets regulated output voltage with 1.223V internal reference. |
| SYNC (Pin 11) | PLL synchronization input | Accepts 50–650kHz external clock - aligns GATE1 rising edge to SYNC rising edge for deterministic multi-phase timing. |
| CLKOUT (Pin 10) | Phase-locked clock output | Drives SYNC input of downstream LTC3862 - enables daisy-chained 2-/3-/4-/6-/12-phase systems without external clock generator. |
| PHASEMODE (Pin 4) | Inter-channel phase configuration | Float/SGND/3V8 selects 180°/180°/120° CH1–CH2 phase offset - reduces input capacitor RMS current in multi-phase designs. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~30% vs. single-phase, lowering thermal stress and component count. |
| Programmable leading-edge blanking | Adjustable minimum on-time (180ns/260ns/340ns via BLANK pin) - suppresses gate-drive-induced current-sense noise during MOSFET turn-on. |
| Internal cascaded LDOs | 5V INTVCC (for gate drivers) + 3.8V 3V8 (for analog/digital core) - eliminates need for external bias rails while isolating power domains. |
| Precision RUN pin threshold | 1.22V enable threshold with 80mV hysteresis - enables clean, noise-immune power sequencing in multi-rail systems. |
| Adjustable slope compensation | SLOPE pin sets gain (0.625×/1.0×/1.66× nominal) - stabilizes current mode control across wide duty cycle and inductor value ranges. |
Applications
| Automotive 48V Mild Hybrid Systems | Industrial Telecom Intermediate Bus |
|---|---|
Use Scenario: Step-up from 12V/24V battery to 48V rail powering ADAS cameras, radar modules, and infotainment subsystems. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel power stages with synchronized switching to minimize EMI and input ripple. Use Value: 96% max duty cycle enables direct 12V→48V conversion; AEC-Q100 qualified variants support automotive reliability requirements. | Use Scenario: Generating stable 48V intermediate bus from 24V or 36V industrial power supply for PoE++ switches and base station RF amplifiers. IC Role / Device Role / Timing Role: High-efficiency, multi-phase DC/DC controller delivering >5A continuous output with tight load regulation. Use Value: Interleaved operation cuts input capacitance requirement by 50%; programmable frequency avoids sensitive RF bands. |
| Medical Imaging Power Modules | Test Equipment High-Voltage Bias Supplies |
Use Scenario: Providing low-noise, tightly regulated 40–60V bias for CCD/CMOS image sensors and X-ray detector arrays. IC Role / Device Role / Timing Role: Precision current-mode controller ensuring stable output under dynamic imaging load transients. Use Value: ±1% reference and <10mV current-sense matching ensure <0.5% output voltage drift across temperature and line variation. | Use Scenario: Generating programmable high-voltage bias (up to 60V) for semiconductor parametric test fixtures and laser diode drivers. IC Role / Device Role / Timing Role: Adjustable max duty cycle and soft-start enable safe ramp-up of high-voltage outputs without arcing. Use Value: DMAX and SS pins allow user-defined voltage slew rate and overvoltage protection thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IUH#TRPBF | Same functionality, 5mm × 5mm QFN package (θJA = 44°C/W vs. 85°C/W for SSOP) | Better thermal performance required for >3A continuous output or high ambient temperature environments | Select when board space allows QFN and thermal management is critical; pinout differs - not drop-in compatible. |
| LTC3862IFE#TRPBF | Same SSOP package but I-grade (–40°C to 125°C) vs. E-grade (–40°C to 85°C); identical electrical specs | Required for under-hood automotive or extended-temperature industrial deployments | Choose when operating junction temperature exceeds 85°C; no circuit or layout changes needed beyond thermal validation. |
Compared with LTC3862EGN#TRPBF, the IUH variant offers superior thermal dissipation in compact layouts, while the IFE variant extends operational temperature range without altering electrical behavior-both retain full feature parity including SYNC/CLKOUT multi-phase support and DMAX/SLOPE/BLANK configurability.
Availability
LTC3862EGN#TRPBF is available at Aetrix Electronics and suitable for automotive 48V systems, industrial telecom power supplies, and medical imaging equipment requiring stable component supply with long-term production continuity.
Supply support for LTC3862EGN#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices (now part of Analog Devices, Inc., a subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3862 product line delivers high-efficiency, multi-phase boost and SEPIC controllers targeting demanding automotive, industrial, and telecom power applications where precision regulation, thermal robustness, and synchronization scalability are essential.
FAQ
What is the maximum achievable output voltage using LTC3862EGN#TRPBF in a boost configuration?
The LTC3862EGN#TRPBF itself does not impose a hard upper limit on output voltage; it is constrained by external component ratings and stability. With its 96% max duty cycle and 36V max VIN, practical output voltages reach 48V–60V in well-designed boost converters using appropriate MOSFETs, diodes, and output capacitors rated for ≥2× VOUT. The IC's 5V gate drive targets logic-level MOSFETs optimized for <60V VDS.
Does LTC3862EGN#TRPBF support synchronization to an external clock, and what is the valid frequency range?
Yes, LTC3862EGN#TRPBF supports external clock synchronization via its SYNC pin, which accepts input frequencies from 50kHz to 650kHz. The internal PLL locks to the external clock, aligning the rising edge of GATE1 with the SYNC rising edge. This enables deterministic multi-phase operation across multiple LTC3862EGN#TRPBF units in daisy-chain configurations.
How does the DMAX pin affect the operation of LTC3862EGN#TRPBF, and what are the three supported settings?
The DMAX pin on LTC3862EGN#TRPBF programs the maximum duty cycle: connecting to SGND sets 96%, leaving it floating sets 84%, and connecting to 3V8 sets 75%. This setting derives from a precise 12× internal clock and prevents instability or shoot-through in high-step-up applications. All three values are guaranteed across temperature and process variation.
Can LTC3862EGN#TRPBF be used in SEPIC topology, and what design considerations apply?
Yes, LTC3862EGN#TRPBF supports SEPIC topology per its datasheet description and typical application circuits. Key considerations include using coupled inductors or separate inductors with matched values, ensuring proper current-sense placement on the switch node side, and verifying loop stability with slope compensation adjusted via the SLOPE pin for the specific duty cycle range.
What is the purpose of the 3V8 pin on LTC3862EGN#TRPBF, and how must it be decoupled?
The 3V8 pin on LTC3862EGN#TRPBF is the output of an internal LDO supplying 3.8V to low-voltage analog and digital control circuitry. It must be decoupled with a 1nF ceramic capacitor (X5R or better) placed between 3V8 and SGND, located as close as possible to the IC. This pin is not intended to power external circuitry.
LTC3862EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 36V
- Frequency - Switching:
- 75kHz ~ 500kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Phase Control, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3862EGN#TRPBF FAQ
1.How can I place an order for LTC3862EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EGN#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3862EGN#TRPBF reliable?
The price and inventory of LTC3862EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EGN#TRPBF?
LTC3862EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EGN#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3862EGN#TRPBF?
For technical support, including LTC3862EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3862EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EGN#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3862EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862EGN#TRPBF?
All LTC3862EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EGN#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3862EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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